#include "irgwalk.h"
#include "time.h"
+/* libfirm/ir/adt includes */
+#include "bipartite.h"
+
/* libfirm/ir/be includes */
#include "bearch.h"
#include "beirg.h"
#include "html_dumper.h"
#include "pbqp_node_t.h"
#include "pbqp_node.h"
+#include "pbqp_edge_t.h"
-#define TIMER 0
-#define PRINT_RPEO 0
+#define TIMER 0
+#define PRINT_RPEO 0
+#define USE_BIPARTIT_MATCHING 0
+#define DO_USEFUL_OPT 1
static int use_exec_freq = true;
unsigned idx;
for (idx = 0; idx < colors_n; idx++) {
if (bitset_is_set(ignored_regs, idx) || !arch_reg_out_is_allocatable(irn, arch_register_for_index(cls, idx))) {
+ /* constrained */
vector_set(costs_vector, idx, INF_COSTS);
cntConstrains++;
}
if (get_edge(pbqp, get_irn_idx(src_node), get_irn_idx(trg_node)) == NULL) {
- /* increase ife edge counter */
+// /* increase ife edge counter */
pbqp_alloc_env->ife_edge_num[get_irn_idx(src_node)]++;
pbqp_alloc_env->ife_edge_num[get_irn_idx(trg_node)]++;
+#if DO_USEFUL_OPT || USE_BIPARTIT_MATCHING
/* do useful optimization to speed up pbqp solving (we can do this because we know our matrix) */
if (get_free_regs(restr_nodes, cls, src_node) == 1 && get_free_regs(restr_nodes, cls, trg_node) == 1) {
unsigned src_idx = vector_get_min_index(get_node(pbqp, get_irn_idx(src_node))->costs);
}
return;
}
-
+#endif
/* insert interference edge */
insert_edge(pbqp, src_node, trg_node, ife_matrix_template);
}
else {
afe_matrix = pbqp_alloc_env->aff_matrix_template;
}
-
+#if DO_USEFUL_OPT || USE_BIPARTIT_MATCHING
/* do useful optimization to speed up pbqp solving */
if (get_free_regs(restr_nodes, cls, src_node) == 1 && get_free_regs(restr_nodes, cls, trg_node) == 1) {
return;
}
return;
}
-
+#endif
/* insert interference edge */
insert_edge(pbqp, src_node, trg_node, afe_matrix);
}
const arch_register_class_t *cls = pbqp_alloc_env->cls;
plist_t *rpeo = pbqp_alloc_env->rpeo;
pbqp *pbqp_inst = pbqp_alloc_env->pbqp_inst;
- unsigned *restr_nodes = pbqp_alloc_env->restr_nodes;
- pqueue_t *queue = new_pqueue();
- pqueue_t *restr_nodes_queue = new_pqueue();
plist_t *temp_list = plist_new();
- plist_t *sorted_list = plist_new();
+ plist_element_t *el;
ir_node *irn;
ir_nodeset_t live_nodes;
- plist_element_t *el;
- ir_node *last_element = NULL;
+#if USE_BIPARTIT_MATCHING
+ int *assignment = ALLOCAN(int, cls->n_regs);
+// ir_graph *irg = pbqp_alloc_env->irg;
+#else
+ unsigned *restr_nodes = pbqp_alloc_env->restr_nodes;
+ pqueue_t *restr_nodes_queue = new_pqueue();
+ pqueue_t *queue = new_pqueue();
+ plist_t *sorted_list = plist_new();
+ ir_node *last_element = NULL;
+#endif
/* first, determine the pressure */
/* (this is only for compatibility with copymin optimization, it's not needed for pbqp coloring) */
be_liveness_transfer(cls, irn, &live_nodes);
}
+#if USE_BIPARTIT_MATCHING
+ if (get_irn_mode(irn) == mode_T) {
+
+ unsigned clique_size = 0;
+ unsigned n_alloc = 0;
+ pbqp_node *clique[cls->n_regs];
+ bipartite_t *bp = bipartite_new(cls->n_regs, cls->n_regs);
+
+ /* add all proj after a perm to clique */
+ const ir_edge_t *edge;
+ foreach_out_edge(irn, edge) {
+ ir_node *proj = get_edge_src_irn(edge);
+
+ /* ignore node if it is not necessary for register allocation */
+ if (!arch_irn_consider_in_reg_alloc(cls, proj))
+ continue;
+
+ /* insert pbqp node into temp rpeo list of this block */
+ plist_insert_front(temp_list, get_node(pbqp_inst, get_irn_idx(proj)));
+
+ if(is_Perm_Proj(proj)) {
+ /* add proj to clique */
+ pbqp_node *clique_member = get_node(pbqp_inst,proj->node_idx);
+ clique[clique_size] = clique_member;
+ vector *costs = clique_member->costs;
+ unsigned idx = 0;
+ for(idx = 0; idx < costs->len; idx++) {
+ if(costs->entries[idx].data != INF_COSTS) {
+ bipartite_add(bp, clique_size, idx);
+ }
+ }
+
+ /* increase node counter */
+ clique_size++;
+ n_alloc++;
+ }
+ }
+
+ if(clique_size > 0) {
+ plist_element_t *listElement;
+ foreach_plist(temp_list, listElement) {
+ pbqp_node *clique_candidate = listElement->data;
+ unsigned idx = 0;
+ bool isMember = true;
+
+ /* clique size not bigger then register class size */
+ if(clique_size >= cls->n_regs) break;
+
+ for(idx = 0; idx < clique_size; idx++) {
+ pbqp_node *member = clique[idx];
+
+ if(member == clique_candidate) {
+ isMember = false;
+ break;
+ }
+
+ if(get_edge(pbqp_inst, member->index, clique_candidate->index) == NULL && get_edge(pbqp_inst, clique_candidate->index, member->index) == NULL) {
+ isMember = false;
+ break;
+ }
+ }
+
+ /* goto next list element if current node is not a member of the clique */
+ if(!isMember) { continue; }
+
+ /* add candidate to clique */
+ clique[clique_size] = clique_candidate;
+
+ vector *costs = clique_candidate->costs;
+ for(idx = 0; idx < costs->len; idx++) {
+ if(costs->entries[idx].data != INF_COSTS) {
+ bipartite_add(bp, clique_size, idx);
+ }
+ }
+
+ /* increase node counter */
+ clique_size++;
+ }
+ }
+
+ /* solve bipartite matching */
+ bipartite_matching(bp, assignment);
+
+ /* assign colors */
+ unsigned nodeIdx = 0;
+ for(nodeIdx = 0; nodeIdx < clique_size; nodeIdx++) {
+ vector *costs = clique[nodeIdx]->costs;
+ int idx;
+ for(idx = 0; idx < (int)costs->len; idx++) {
+ if(assignment[nodeIdx] != idx) {
+ costs->entries[idx].data = INF_COSTS;
+ }
+ }
+ assert(assignment[nodeIdx] >= 0 && "there must have been a register assigned (node not register pressure faithful?)");
+ }
+
+ /* free memory */
+ bipartite_free(bp);
+ }
+ else {
+ if (arch_irn_consider_in_reg_alloc(cls, irn)) {
+ plist_insert_front(temp_list, get_node(pbqp_inst, get_irn_idx(irn)));
+ }
+ }
+#else
/* order nodes for perfect elimination order */
if (get_irn_mode(irn) == mode_T) {
bool allHaveIFEdges = true;
last_element = NULL;
}
}
+#endif
}
- /* insert nodes into reverse perfect elimination order */
+ /* add the temp rpeo list of this block to the global reverse perfect elimination order list*/
foreach_plist(temp_list, el) {
plist_insert_back(rpeo, el->data);
}
/* free reserved memory */
ir_nodeset_destroy(&live_nodes);
plist_free(temp_list);
+#if USE_BIPARTIT_MATCHING
+#else
plist_free(sorted_list);
del_pqueue(queue);
del_pqueue(restr_nodes_queue);
+#endif
}
static void insert_perms(ir_node *block, void *data)
printf("\n");
#endif
-
/* solve pbqp instance */
#if TIMER
ir_timer_reset_and_start(t_ra_pbqp_alloc_solve);
#if TIMER
ir_timer_stop(t_ra_pbqp_alloc_solve);
#endif
+
+
num solution = get_solution(pbqp_alloc_env.pbqp_inst);
assert(solution != INF_COSTS && "No PBQP solution found");
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